A Dynamic Social Network Data Publishing Algorithm Based on Differential Privacy

Social network contains the interaction between social members, which constitutes the structure and attribute of social network. The interactive relationship of social network contains a lot of personal privacy information. The direct release of social network data will cause the disclosure of privacy information. Aiming at the dynamic characteristics of social network data release, a new dynamic social network data publishing method based on differential privacy was proposed. This method was consistent with differential privacy. It is named DDPA (Dynamic Differential Privacy Algorithm). DDPA algorithm is an improvement of privacy protection algorithm in static social network data publishing. DDPA adds noise which follows Laplace to network edge weights. DDPA identifies the edge weight information that changes as the number of iterations increases, adding the privacy protection budget. Through experiments on real data sets, the results show that the DDPA algorithm satisfies the user’s privacy requirement in social network. DDPA reduces the execution time brought by iterations and reduces the information loss rate of graph structure.

Attacks and Countermeasures in Social Network Data Publishing

With the increasing prevalence of social networks, more and more social network data are published for many applications, such as social network analysis and data mining. However, this brings privacy problems. For example, adversaries can get sensitive information of some individuals easily with little background knowledge. How to publish social network data for analysis purpose while preserving the privacy of individuals has raised many concerns. Many algorithms have been proposed to address this issue. In this paper, we discuss this privacy problem from two aspects： attack models and countermeasures. We analyse privacy conceres, model the background knowledge that adversary may utilize and review the recently developed attack models. We then survey the state-of-the-art privacy preserving methods in two categories： anonymization methods and differential privacy methods. We also provide research directions in this area.

信息生态链视角下出版业数字化运营路径研究

以中国澳门出版业为例,阐释社交网络为出版业数字化运营带来的新机制与新趋势。在此基础上,以信息生态链理论为指导,从内容生态、用户生态和环境生态三个层面进一步挖掘其信息链构成要素,构建社交网络应用下出版业数字化运营信息生态链结构模型。为提升数字化运营能力,出版业需要重视持续信息流转与能量交互,进一步强化顶层设计,重塑文化生产要素,实现多元主体价值共创,促进出版业协调有序建设、健康平衡发展。

一种结合神经网络和敏感位置语义的轨迹隐私保护方法

目前,现有的轨迹隐私保护工作大多数考虑的是敏感位置或敏感区域,未能考虑到敏感位置语义且未能精准的描述出位置语义的敏感程度.针对此问题,本文提出了一个TP-SLS(A trajectory privacy protection method combining neural networks and sensitive location semantics)方法.首先,提出了敏感度感知算法,用于量化位置语义敏感度,实现“原子化”保护.其次,为了构建用户的敏感移动场景,建立了一个包含时空信息和位置语义敏感度的四元组并使用差分隐私进行干扰.同时,使用深度神经网络预测轨迹.最后,由于预测的轨迹存在废数据,提出了基于强化学习的优化轨迹算法,用于提高数据质量,完成轨迹数据发布.实验结果表明,TP-SLS方法在隐私保护强度和数据可用性两个方面优于现有的方案.

面向价值网络的高校馆社协同出版服务研究——基于北美地区iCaucus院校的调研

我国高校图书馆进入了未来学习中心建设的改革阶段,需要高等学校在整体规划上统筹和协作。在协同共生与价值网络的理论基础上,文章以北美地区iCaucus院校馆社协同出版服务为研究对象,运用文献调研与网络调研的方法,从协同治理、价值创造和价值流动三个方面具体分析其实践情况。以此立足我国的基本国情,从制定高校馆社协同出版服务流程管理、注重高校馆社异质资源整合、共建多元协同平台链接模式三方面,构建我国高校馆社协同出版服务价值网络。

智媒时代综合社科类出版机构微博传播网络研究——基于社会网络视角

在智媒时代,传播主体、渠道和内容都发生了变化,其给厘清综合社科类出版机构的信息传播行动者网络以及其如何与受众建立稳定强关系的传播网络等问题带来挑战。基于社会网络视角,采用社会网络分析法,对9家综合社科类出版机构微博账号发布的信息进行了量化分析。研究结果表明,智媒时代综合社科类出版机构微博传播网络信息由信源发出后,经意见领袖和平台进一步传递至普通用户;在这一过程中,意见领袖具有桥接作用,其通过日常互动将信源和受众间的弱关系转化为强关系,且呈现圈子式的网络特征。

基于贝叶斯网络的差分隐私高维数据发布技术研究

在实现隐私保护的同时提高数据可用性是高维结构化数据发布研究中的挑战性问题,经典算法Priv Bayes针对该问题提供了一种解决方案。为进一步减少计算开销、提高数据可用性,提出基于贝叶斯网络的差分隐私数据发布算法ELPriv Bayes。分析贝叶斯网络结构学习阶段的理论计算开销,构建存储属性之间互信息的相关矩阵,避免结构学习算法迭代过程中互信息的冗余计算,降低了时间复杂度。基于平均互信息优化了节点进入贝叶斯网络的顺序,提高结构学习迭代过程中指数机制贡献的互信息期望值,进而提高生成数据集与原始数据集的统计近似度,并实证分析网络结构质量对首节点选择的低敏感性。在4个典型数据集上的实验结果表明,与经典算法Priv Bayes及其改进方案相比较,结构学习阶段的计算开销降低了97%~99%,基于指数机制捕获的互信息提高了14%~67%,生成数据集与原始数据集的平均变差距离降低了32%~40%,构建的支持向量机(SVM)分类器的准确率提高了4%~5%,并且当ε≤0.8时,采用ELPriv Bayes算法生成数据的可用性提升更为显著。

计算机技术在传统出版中的应用研究

现代技术发展为各行业提供了更多选择和支持,包括传统出版在内,这也要求其进一步加强技术研究和应用。本文以计算机技术带给传统出版行业的积极影响为切入点,分析其应用思路、方法,包括作业系统建设、运用范围拓展等,展望计算机技术在传统出版中的应用前景,以期为技术优势的发挥以及传统出版行业发展提供少许参考。

“一带一路”沿线国家出版产品贸易格局与中国应对策略

为探究“一带一路”沿线国家出版产品贸易的发展态势,运用社会网络分析法观测2011—2022年沿线国家出版产品贸易格局的演化特征,研究发现:(1)沿线国家出版贸易网络结构稳健且具有较大发展空间;(2)不同国家出版贸易地位差异大,中国在“一带一路”沿线国家出版产品贸易网络中最具影响力、发挥“桥梁”作用最显著;(3)出版贸易格局呈现明显的核心边缘结构,中国、新加坡、泰国、马来西亚在整个网络中占据核心位置。针对我国与沿线国家出版贸易潜力亟待挖掘、与部分“桥梁”国家的贸易合作深度不足、出版贸易地理结构失衡问题,我国应发挥引领作用,技术赋能区域内资源建设;增强文化价值认同,匹配差别国家需求;优化贸易地理结构,分层次拓展海外市场。

出版物二维码安全应用管理策略——以华东师范大学出版社“码管家”为例

探讨出版物二维码安全应用管理策略,为出版单位在出版物上安全使用二维码提供借鉴和参考。文章通过分析二维码在出版物中的应用现状,以及在网络安全防护、系统管理等方面存在的风险,以华东师范大学出版社研发的“码管家”的应用实践为例,从信息层、管理层、数据层、安全层四个层面分析其安全管理出版物二维码的探索与创新。

基于联合树的高维数据本地化差分隐私保护算法

为解决发布高维数据过程中复杂的属性关联问题并避免中心服务器不可信任的问题,提出一种基于联合树的高维数据本地化差分隐私保护算法(JT-LDP算法)。基于不可信的中心服务器实现对用户数据的本地化差分隐私保护,中心服务器接收到用户本地化差分隐私保护的数据后,基于联合树算法识别高维数据的属性相关性,将高维数据属性集分割成多个独立的低维属性集。通过采样合成新的数据集进行发布。实验结果表明,JT-LDP算法在高维数据情况下具有更高的精度。

Cross-Layer QoS Enabled SDN-Like Publish/Subscribe Communication Infrastructure for IoT

Publish/subscribe paradigm is often adopted to create the communication infrastructure of the Internet of Things(IoT)for many clients to access enormous real-time sensor data.However,most current publish/subscribe middlewares are based on traditional ossified IP networks,which are difficult to enable Quality of Service(QoS).How to design the next generation publish/subscribe middleware has become an urgent problem.The emerging Software Defined Networking(SDN)provides new opportunities to improve the QoS of publish/subscribe facilities for delivering events in IoT owing to its customized programmability and centralized control.We can encode event topics,priorities and security policies into flow entries of SDN-enabled switches to satisfy personalized QoS needs.In this paper,we propose a cross-layer QoS enabled SDN-like publish/subscribe communication infrastructure,aiming at building an IoT platform to seamlessly connect IoT services with SDN networks and improving the QoS of delivering events.We first present an SDN-like topic-oriented publish/subscribe middleware architecture with a cross-layer QoS control framework.Then we discuss prototype implementation,including topic management,topology maintenance,event routing and policy management.In the end,we use differentiated services and cross-layer access control as cross-layer QoS scenarios to verify the prototype.Experimental results show that our middleware is effective.

An SDN-Based Publish/Subscribe-Enabled Communication Platform for IoT Services

Publish/subscribe paradigm paves a way to integrate and serve many scalable, inter-operable Internet of Things(IoT) applications. The increasing IoT applications require new properties of publish/subscribe communication model, for example, strict quality of service(Qo S) guarantees, supporting a large number of widely distributed devices, etc. Software Defined Networking(SDN) enables personalized programming and individualized QoS supports for different applications. The combination of the two will have a good prospect. In this paper, we present an IoT-oriented communication platform which combines the publish/subscribe paradigm with SDN, aiming at establishing an IoT ecosystem to facilitate IoT services/applications accessing internet. We design the interaction logic of topic-based publish/subscribe middleware, and describe the setup and maintenance of topology information as well as event routing in detail, considering the characteristics of SDN. Finally, we exemplify its practicability with a deployed District Heating Control and Information Service System(DHCISS) and validity the effectiveness with some experiments.

Providing Delay-Guaranteed Multicast Transmission Services for an SDN-Based Publish/Subscribe System

Providing end-to-end delay guarantees in traditional Internet is a complex task due to the distributed nature of TCP/IP protocols. Software Defined Networking(SDN) gives a new dimension to improve QoS(Quality of Service) as it can benefit from its flexibility, programmability and centralized view. In this paper, we provide delay-guaranteed data transmission service instead of "best efforts" service for a topic-based publish/subscribe system by means of exploring these specific features of SDN. We attribute this routing problem in such conditions to Delay-Constraint Lowest Cost Steiner Tree(DCLCST) problem. To solve it, we compute the shortest delay paths from source node to every subscribe node and the shortest cost paths from every subscribe node to any other node using dijkstra algorithm. Then we construct a delay-constraint least cost steiner tree for per-topic based on these paths as multicast tree. We also present experimental results to demonstrate the effectiveness of the algorithms and methods we proposed.

学术期刊如何实现数字出版的内涵式发展--基于数字出版历史演进及现状分析

我国学术期刊数字出版经历了印后电子化、预印本、优先出版和网络首发四种模式。预印本平台实现了学术成果的“速发”“首发”,优先出版和网络首发则进一步规范了数字出版的形态。但在我国现行的学术成果认定机制下,学术期刊缺少深化数字出版的内核动力和外延助力,严重制约了数字出版发展进程。学术期刊应充分发挥学术引领作用,形成数字出版主体意识,从而打破现有的政策机制桎梏和市场运营劣势;要有意识地加快数字出版融合发展平台构建,并充分发挥人的主观能动性,针对数字出版的形态特征培养多元化的编辑人才,利用学术期刊的品牌价值和编辑队伍的数字出版及策划能力打造学术共同体,真正推动学术期刊数字出版内涵式发展。

基于BIGRU的轨迹数据发布隐私保护方案

在保证轨迹数据发布隐私性的同时,需要提高发布数据的可用性,将机器学习算法应用于轨迹数据处理可以提高轨迹数据的可用性。针对轨迹数据发布可用性问题,提出一种面向轨迹数据发布的结合双向门控循环单元(bidirectional gated recurrent unit,BIGRU)和差分隐私(differential privacy,DP)的轨迹隐私保护方案。通过应用BIGRU对轨迹数据进行预处理从而提高轨迹数据的可用性,对轨迹数据进行聚类泛化并使用差分隐私指数机制进行分区选择从而达到了隐私保护的目的,将得到的泛化轨迹数据集进行异常处理并发布。仿真实验结果表明,该方案不仅具有较好的数据可用性,也有一定的效率优势。

A Real-Time-Enabled, Blackboard-Based, Publish/Subscribe Architecture for Wireless Sensor Nodes

Wireless sensor network nodes have only limited resources concerning memory and battery life-time. Mem- ory can be efficiently used by sharing data, and the life-time of a battery can be extended, when the node has long power saving sleep-phases. We propose a publish/subscribe architecture that achieves these two aims. The results of our work are of great interest for sensor application developers, giving them now the opportu- nity to use our architecture for sharing data among different applications on the node as well as the different layers of the operating system. We introduce a blackboard which is used for centrally storing published val- ues, like measured data from a monitored sensor. This makes it possible to share stored data without monitoring the sensors once again, which is advantageously concerning power consumption, memory space, and reaction time. Beside the proposed publish/subscribe method for sensor nodes with its notification possibili- ties, our architecture fulfills also real-time requirements. We show how the well-known sensor operating system MANTIS OS can be extended by a real-time enabled, blackboard-based publish/subscribe architect- ture. This architecture and first of all its implementation is of special interest for cross layer optimization of sensor applications. Cross-layer approaches benefit from our architecture because the available implementa- tion can be used as an efficient framework for central storing and managing of shared values.

江西省水稻需水量预报与网络发布系统开发

为了促进江西省灌区技术现代化及灌溉用水管理现代化的发展,为实时灌溉决策提供较为精确和及时的作物需水量预报数据支持,开发了江西省逐日水稻需水量预报与网络发布系统。系统通过关系型数据管理系统MySQL来获取水稻需水量预报模型计算所需的参数及基本信息,分别使用率定了的Hargreaves-Samani(HS)模型、Blaney-Criddle(BC)模型、McCloud(MC)模型和作物系数来预测江西省未来7天26个气象站点的作物腾发量ETc值。用户可登陆网址查询任意站点、任意水稻生长阶段、任意模型预报的ETc数值,页面简洁,易于操作。总体而言,率定后的4种模型均具有较高的预报精度,可用于全省的水稻需水量预报,为灌溉决策和节约灌溉用水提供科学依据。

网络知识社区出版服务的内容生产模式

为探索网络知识社区如何开展出版服务、提升内容质量,文章采用案例分析法,分析知乎、豆瓣、雪球、果壳网、丁香园五个典型网络知识社区的出版服务,按照出版服务提供者的不同,总结出三种模式,即用户主导型内容生产模式、平台主导型内容生产模式和平台用户双主导型内容生产模式,并从激励机制、质量把关和知识变现三个层面对三种模式进行比较分析,指出不同模式下网络知识社区出版服务面临的主要困境,并提出未来转型升级的路径。

作为“行动者”的出版网络:对数字出版的再解释

长久以来,学界对数字出版的解释多立足出版主体依靠计算机技术进行印刷、出版的数字化信息生成方式。此种界定将出版技术主体与技术的关系界定为人对技术的单向性实践,由此导致谈及传统出版的数字化转型就被局限于高新技术设备作为工具的功能更新换代,而忽视了由数字技术逻辑引发的信息组织方式的变革。拉图尔的行动者网络理论强调人与非人行动者的网络化平等构建,力图将社会实践视为人与技术的网络协同合作。在此视域下,数字出版应被视为以数字技术逻辑重新组织、建构的出版网络实践,将数字出版的行动者网络在形态、内容、连接三方面付诸出版实践。